package com.webserver.core;

import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

/**
 * 该线程任务负责与指定客户端完成HTTP交互
 * 与客户端交流的流程分为三步:
 * 1.解析请求
 * 2.处理请求
 * 3.发送响应
 */
public class ClientHandler implements Runnable{
    private Socket socket;
    public  ClientHandler(Socket socket){
        this.socket = socket;
    }

    @Override
    public void run() {

        try {
            //解析请求
            //1.1 解析请求行
            String line = readLine();
            System.out.println(line);
            //请求相关信息
            String [] array = line.split("\\s");
            String method = array[0];//存储请求方式
            String uri = array[1];//存储抽象路径
            String protocol = array[2];//存储协议版本

            //1.2 解析消息头
            Map<String,String> headers = new HashMap<>();
            while(true){
                line = readLine();
                if(line.isEmpty()){
                    break;
                }
                System.out.println("消息头:"+line);
                array = line.split("\\s");
                headers.put(array[0],array[1]);
            }


            //http://localhost:8088/myweb/index.html
            System.out.println("method:"+method);       //GET
            System.out.println("uri:"+uri);             //
            System.out.println("protocol:"+protocol);   //HTTP/1.1

        } catch (IOException e) {
            e.printStackTrace();
        }


    }



    /**
     * 通过socket获取的输入流读取客户端发送过来的一行字符串
     */
    private  String readLine() throws IOException {
        //读取客户端发过来的消息
        InputStream in = socket.getInputStream();

        char pre = 'a', cur = 'a';
        StringBuilder builder = new StringBuilder();
        int d;
        while((d = in.read())!=-1){
            cur = (char)d;//本次读取到的字符
            if(pre == 13 && cur ==10){//判断是否连续读到回车和换行符
                break;
            }
            builder.append(cur);
            pre = cur;//再进行下次读取字符前将本次读取的字符记作上次读取的字符
        }
        return builder.toString().trim();

    }
}
